This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...s perception of reality. It means a commitment to the principle that all of one’s convictions, values, goals, desires and actions must be based on, derived from, chosen and validated by a proc
ess of thought — as precise and scrupulous a process of thought, directed by as ruthlessly strict an application of logic, as one’s fullest capacity permits. It means one’s acceptance of t
he responsibility of forming one’s own judgments and of living by the work of one’s own mind (which is the virtue of Independence). It means that one must never sacrifice one’s convictions...
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